Environmental Engineering Reference
In-Depth Information
where
Ti
4
∫
OH
indicates the hydroxyl radical is still associated with the Ti
4
site
Recombination
:
he heat
vb
+
+→
cb
Tra p p i ng
:
4
−
−
+
4
Ti
OH
+ →∫
h iOH
vb
Ti
4
−
HO h iOHH
vb
+ →∫
+
4
+
+
2
Rh
+→
+
R
+
i,ads
vb
i,ads
where R refers to a Rideal mechanism
Ti
4
+→
e
−
T
3
cb
i
Ti
3
+→−
OTO
i
4
2
2
Hydroxyl attack
:
Ti
4
∫
OH
+ →+
R
Ti
4
R
1
,ads
2
,ads
OH
∙
+ R
1,ads
→ R
2,ads
Ti
4
∫
OH
+ →+
R i
4
R
1
2
OH
∙
+ R
1
→ R
2
Reaction of other radicals
:
e i
−
+−+ →
4
O
−
2
(
H iHO
+
)
4
(
)
cb
2
22
Ti
4
−+→
OH Ti
−
(
+
)
4
(
HO
)
2
2
(
HO
)
+ →+
(
OH
)
(
HO
−
)
(
HO
)
22
2
2
